Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Deformation criterion of the prefracture state of truss-structure elements and an acoustic-emission resonance technique on their basis
The results of theoretical and experimental studies of the prefracture state of truss-structure elements with a cut determined by finite-element analysis of the resonance frequencies and modes of forced vibrations, which are associated with the time history of the acoustic-emission parameters, are given. The natural frequencies of plane vibration modes of a delta-shaped truss-structure element most sensitive to changes in the geometrical dimensions (the depth and angle of opening) of a cut are determined. A relationship between the angle of the cut opening and the value of displacements (accelerations) at the truss-structure model points adjacent to the cut is formulated. It is shown that the angle of the cut opening, calculated using this relationship, is completely a deformation criterion of the prefracture state of structures. The values of resonance frequencies of forced vibrations of structure elements at which the critical angle is reached and over which intense cracking begins are found.
Deformation criterion of the prefracture state of truss-structure elements and an acoustic-emission resonance technique on their basis
The results of theoretical and experimental studies of the prefracture state of truss-structure elements with a cut determined by finite-element analysis of the resonance frequencies and modes of forced vibrations, which are associated with the time history of the acoustic-emission parameters, are given. The natural frequencies of plane vibration modes of a delta-shaped truss-structure element most sensitive to changes in the geometrical dimensions (the depth and angle of opening) of a cut are determined. A relationship between the angle of the cut opening and the value of displacements (accelerations) at the truss-structure model points adjacent to the cut is formulated. It is shown that the angle of the cut opening, calculated using this relationship, is completely a deformation criterion of the prefracture state of structures. The values of resonance frequencies of forced vibrations of structure elements at which the critical angle is reached and over which intense cracking begins are found.
Deformation criterion of the prefracture state of truss-structure elements and an acoustic-emission resonance technique on their basis
Verformungskriterium des Vorbruchzustandes von Fachwerk-Bauelementen und ein Schallemissions-Resonanzverfahren auf dieser Grundlage
Akopyan, V.A. (Autor:in)
Russian Journal of Nondestructive Testing ; 45 ; 164-170
2009
7 Seiten, 5 Bilder, 1 Tabelle, 11 Quellen
Aufsatz (Zeitschrift)
Englisch
| British Library Online Contents | 2009
Modeling of Material Deformation Kinetics in the Prefracture Zone
| British Library Online Contents | 2003
| British Library Online Contents | 2012
| British Library Online Contents | 2002
Similitude Law of Prefracture Hysteresis of Steel Members
| Online Contents | 2004